Article.
Silagadze Z. K.Neutrino mass and mirror universe // Physics of Atomic Nuclei. Maik Nauka/Interperiodica Publishing. Russian Federation. - P.272-275. - ISSN 10637788. - EISSN 1562692X.The existence of the mirror world, with the same microphysics as our own one but with opposite P-asymmetry, not only restores an exact equivalence between left and right but also naturally explains, via a seesaw-like mechanism, why the neutrino is ultralight.

Article.
Makhaldiani N. V., Silagadze Z. K.Do maxicharged particles exist? // International Journal of Theoretical Physics. Kluwer Academic/Plenum Publishers. United States. - P.1933-1939. - ISSN 00207748. - EISSN 15729575.The critical charge Zc is estimated for elementary particles using a Newton-Wigner position operator-inspired model. Particles with Z ∼ Zc (maxicharged particles), if they exist at all, can have unusual properties which make them illusive objects, that are not easy to detect. Dirac's magnetic poles have a (magnetic) charge g ≫ Zc. This gives one more argument that it is unexpected for pointlike monopoles to be found in our world, where α-1 ≃ 137.

Article.
Silagadze Z. K.Mirror world versus large extra dimensions // Modern Physics Letters A. World Scientific Publishing Co. Singapore. - P.2321-2328. - ISSN 02177323.Recently proposed low scale quantum gravity scenario is expected to have a significant impact on the mirror world hypothesis. Some aspects of this influence is investigated here, assuming that the fundamental gravity scale is near a TeV. It is shown that future colliders will be capable of producing the mirror matter, but an experimental signature, which will distinguish such events from the background, is not clear. The "smoking gun" signals of the mirror world would be an observation of decays like Υ(2S) → χ̃b2γ. But unfortunately the expected branching ratios are very small. Finally, it is shown that a mirror supernova will be quite a spectacular event for our world too, because a considerable amount of ordinary energy is expected to be emitted in the first few seconds.

Article.
Foot R., Silagadze Z. K.Do mirror planets exist in our solar system? // Acta Physica Polonica, Series B.. Jagellonian University. Poland. - P.2271-2278. - ISSN 05874254.Mirror matter is predicted to exist if parity is an unbroken symmetry of nature. Currently, there is a large amount of evidence that mirror matter actually exists coming from astrophysics and particle physics. One of the most fascinating (but speculative) possibilities is that there is a significant abundance of mirror matter within our solar system. If the mirror matter condensed to form a large body of planetary or stellar mass then there could be interesting observable effects. Indeed studies of long period comets suggest the existence of a solar companion which has escaped direct detection and is, therefore, a candidate for a mirror body. Nemesis, hypothetical "death star" companion of the Sun, proposed to explain biological mass extinctions, may potentially be a mirror star. We examine the prospects for detecting these objects if they do indeed exist and are made of mirror matter.

Article.
Silagadze Z. K.Lepton-flavor violating decays as probes of quantum gravity? // Physica Scripta. Royal Swedish Academy of Sciences. Sweden. - P.128-133. - ISSN 00318949.Lepton flavor violating decays Z → μτ and J/Ψ, γ → μτ are considered. It is shown that these decays can reach sizeable magnitudes if some specific lepton-flavor violating 4-fermion operators are generated by low scale quantum gravity effects, or by some other new physics at a TeV scale.

Article.
Silagadze Z. K.Mirror objects in the solar system? // Acta Physica Polonica, Series B.. Jagellonian University. Poland. - P.1325-1341. - ISSN 05874254.This talk was given at the Tunguska-2001 international conference but it is not about the Tunguska event. Instead we tried to give some flavor of mirror matter, which is predicted to exist if parity is an unbroken symmetry of nature, to non-experts. The possible connection of the mirror matter ideas to the Tunguska phenomenon was indicated by Foot and Gninenko some time ago and was elaborated by Foot in the separate talk at this conference. If the mirror world interpretation of the Tunguska like events is indeed correct then the most fascinating (but very speculative) possibility is that some well known celestial bodies with strange properties are in fact made mostly from mirror matter, and so maybe the mirror world was discovered long ago and we just have not suspected this!

Article.
Kuraev E. A., Silagadze Z. K.Vacuum engineering at a photon collider? // Acta Physica Polonica, Series B.. Jagellonian University. Poland. - P.4019-4071. - ISSN 05874254.The aim of this paper is twofold: to provide a rather detailed and self-contained introduction into the physics of the Disoriented Chiral Condensate (DCC) for the photon (and linear) collider community, and to indicate that such physics can be searched and studied at photon colliders. Some side tracks are also occasionally followed during the exposition, if they lead to interesting vistas. For gourmets, the Baked Alaska recipe is given in the appendix.

Article.
Silagadze Z. K.Gamma-ray bursts: A centauro's cry? // Acta Physica Polonica, Series B.. Jagellonian University. Poland. - P.881-889. - ISSN 05874254.Gamma-ray bursts are enigmatic flashes of gamma-rays at cosmological distances, so bright that the implied energetics is astounding: energies of order of about solar rest-energy are liberated in a time scale of the order of seconds in space regions only a few kilometres in size. Central engines capable to produce such enormous explosions, leading to a highly relativistic expending fireballs, remain a mystery. Here we propose a new candidate for the gamma-ray bursts central engine.

Article.
Silagadze Z. K.Tunguska genetic anomaly and electrophonic meteors // Acta Physica Polonica, Series B.. Jagellonian University. Poland. - P.935-964. - ISSN 05874254.One of great mysteries of the Tunguska event is its genetic impact. Some genetic anomalies were reported in the plants, insects and people of the Tunguska region. Remarkably, the increased rate of biological mutations was found not only within the epicenter area, but also along the trajectory of the Tunguska Space Body (TSB). At that no traces of radioactivity were found, which could be reliably associated with the Tunguska event. The main hypotheses about the nature of the TSB, a stony asteroid, a comet nucleus or a carbonaceous chondrite, readily explain the absence of radioactivity but give no clues how to deal with the genetic anomaly. A choice between these hypotheses, as far as the genetic anomaly is concerned, is like to the choice between "blue devil, green devil and speckled devil", to quote late Academician N.V. Vasilyev. However, if another mysterious phenomenon, electrophonic meteors, is evoked, the origin of the Tunguska genetic anomaly becomes less obscure.

Article.
Silagadze Z. K.Zeno meets modern science // Acta Physica Polonica, Series B.. Jagellonian University. Poland. - P.2887-2929. - ISSN 05874254."No one has ever touched Zeno without refuting him". We will not refute Zeno in this paper. Instead we review some unexpected encounters of Zeno with modern science. The paper begins with a brief biography of Zeno of Elea followed by his famous paradoxes of motion. Reflections on continuity of space and time lead us to Banach and Tarski and to their celebrated paradox, which is in fact not a paradox at all but a strict mathematical theorem, although very counterintuitive. Quantum mechanics brings another flavour in Zeno paradoxes. Quantum Zeno and anti-Zeno effects are really paradoxical but now experimental facts. Then we discuss supertasks and bifurcated supertasks. The concept of localisation leads us to Newton and Wigner and to interesting phenomenon of quantum revivals. At last we note that the paradoxical idea of timeless universe, defended by Zeno and Parmenides at ancient times, is still alive in quantum gravity. The list of references that follows is necessarily incomplete but we hope it will assist interested reader to fill in details.

Article.
Silagadze Z. K.Maxwell's demon through the looking glass // Acta Physica Polonica, Series B.. Jagellonian University. Poland. - P.101-126. - ISSN 05874254.Mechanical Maxwell's demons, such as Smoluchowski's trapdoor and Feynman's ratchet and pawl need external energy source to operate. If you cease to feed a demon the Second Law of thermodynamics will quickly stop its operation. Nevertheless, if the parity is an unbroken symmetry of nature, it may happen that a small modification leads to demons which do not need feeding. Such demons can act like perpetuum mobiles of the second kind: extract heat energy from only one reservoir, use it to do work and be isolated from the rest of ordinary world. Yet the Second Law is not violated because the demons pay their entropy cost in the hidden (mirror) sector of the world by emitting mirror photons.

Article.
Silagadze Z. K.Relativity without tears // Acta Physica Polonica, Series B.. Jagellonian University. Poland. - P.811-885. - ISSN 05874254.Special relativity is no longer a new revolutionary theory but a firmly established cornerstone of modern physics. The teaching of special relativity, however, still follows its presentation as it unfolded historically, trying to convince the audience of this teaching that Newtonian physics is natural but incorrect and special relativity is its paradoxical but correct amendment. I argue in this article in favor of logical instead of historical trend in teaching of relativity and that special relativity is neither paradoxical nor correct (in the absolute sense of the nineteenth century) but the most natural and expected description of the real space-time around us valid for all practical purposes. This last circumstance constitutes a profound mystery of modern physics better known as the cosmological constant problem.

ConferencePaper.
Chashchina Olga, Iorio Lorenzo, Silagadze ZurabElementary derivation of the lense-thirring precession // Acta Physica Polonica, Series B.. Jagellonian University. Poland. - P.2363-2378. - ISSN 05874254.An elementary pedagogical derivation of the Lense-Thirring precession is given based on the use of Hamilton vector. The Hamilton vector is an extra constant of motion of the Kepler/Coulomb problem related simply to the more popular Runge-Lenz vector. When a velocity-dependent Lorentz-like gravitomagnetic force is present, the Hamilton vector, as well as the canonical orbital momentum are no longer conserved and begin to precess. It is easy to calculate their precession rates, which are related to the Lense-Thirring precession of the orbit.

Review.
Silagadze Z. K.Citation entropy and research impact estimation // Acta Physica Polonica, Series B.. Jagellonian University. Poland. - P.2325-2333. - ISSN 05874254.A new indicator, a real valued s-index, is suggested to characterize a quality and impact of the scientific research output. It is expected to be at least as useful as the notorious h-index, at the same time avoiding some of its obvious drawbacks. However, surprisingly, the h-index is found to be quite a good indicator for majority of real-life citation data with their alleged Zipfian behaviour for which these drawbacks do not show up. The style of the paper was chosen deliberately somewhat frivolous to indicate that any attempt to characterize the scientific output of a researcher by just one number always has an element of a grotesque game in it and should not be taken too seriously. I hope this frivolous style will be perceived as a funny decoration only.

Article.
Silagadze Z. K.On the finslerian extension of the schwarzschild metric // Acta Physica Polonica, Series B.. Jagellonian University. Poland. - P.1199-1206. - ISSN 05874254.We provide a Finslerian extension of the Schwarzschild metric based on heuristic arguments. The proposed metric asymptotically approaches not the Minkowski space-time but the Bogoslovsky locally anisotropic space-time which arises naturally as a deformation of very special relativity.

Article.
Chashchina O. I., Silagadze Z. K.Breaking the light speed barrier // Acta Physica Polonica, Series B.. Jagellonian University. Poland. - P.1917-1952. - ISSN 05874254.As it is well known, classical special relativity allows the existence of three different kinds of particles: bradyons, luxons and tachyons. Bradyons have non-zero mass and hence always travel slower than light. Luxons are particles with zero mass, like the photon, and they always travel with invariant velocity. Tachyons are hypothetical superluminal particles that always move faster than light. The existence of bradyons and luxons is firmly established, while the tachyons were never reliably observed. In quantum field theory, the appearance of tachyonic degrees of freedom indicates vacuum instability rather than a real existence of the faster-than-light particles. However, recent controversial claims of the OPERA experiment about superluminal neutrinos triggered a renewed interest in superluminal particles. Driven by a striking analogy of the old Frenkel-Kontorova model of a dislocation dynamics to the theory of relativity, we conjecture in this note a remarkable possibility of existence of the forth type of particles, elvisebrions, which can be superluminal. The characteristic feature of elvisebrions, distinguishing them from tachyons, is that they are outside the realm of special relativity and their energy remains finite (or may even turn to zero) when the elvisebrion velocity approaches the light velocity.